<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style lang="css">
    .box{
        width: 200px;
        height: 200px;
        background: #5aa878;
        margin: 100px;
    }
</style>
<body>



<div class="box"></div>
<!-- 大家认为上下盒子间距是200px吧 -->
<div class="box"></div>
</body>
</html>
